The risk, as ever, with cases like this is that the reporting in the media is inevitably incomplete and somewhat sensationalised.
It's worth noting that the alleged shouted comment, is just that; it's what the prosecution allege that the defendant said, and what has been widely reported in the press. It is not necessarily what he actually said.
We simply don't know the full circumstances, but we can be certain of one fact; the CPS had the opportunity to make the charge gross negligence manslaughter, which carries a mandatory prison sentence if found guilty, but instead they chose to go for the lesser charge of dangerous cycling, which only attracts a maximum £2500 fine.
My guess is that there was either insufficient evidence for them to go for manslaughter (not likely in view of the eventual outcome) or that there was a degree of contributory negligence on the part of the young lady that was killed.
Jeremy